Support rail for a ladder



FIG. 1 is a front perspective view of a support rail for a ladder;

FIG. 2 is a left side view of a support rail for a ladder;

FIG. 3 is a right side view of a support rail for a ladder;

FIG. 4 is a left side view of a support rail for a ladder; and,

FIG. 5 is a left side view of a support rail for a ladder.

The broken lines shown in the views are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the support rail for a ladder, as shown and described. 